Multi-runner switching valve and injection pump

Abstract

The invention discloses a multi-runner switching valve and an injection pump, the switching valve comprises a stator shell part, a first gasket, a second gasket and a rotor part, the stator shell part is provided with a first concave part and a second concave part located in the first concave part; at least one first gasket is mounted in the second concave part, and at least one second gasket is mounted on the first gasket; the stator shell part is provided with a plurality of branch ports, and the branch ports are communicated to the respective second flow channels through the respective first flow channels; and each second flow channel is provided with an opening in the second concave part. According to the invention, through the design of the special-shaped first gasket and the special-shaped second gasket, the stator and the rotor are combined more tightly, and the sandwich structure enables the sealing performance and the wear resistance of the whole stator to be improved; at least one through hole is formed in the first concave part, and injection warm water can be introduced to wash crystals, so that the risk of abrasion or adhesion is reduced, and the service life is prevented from being shortened.

Description

Technical Field

[0001] The present invention relates to a switching valve for fluid distribution, and particularly to a switching valve for multi-channel switching and an injection pump. Background Art

[0002] When performing delicate operations such as pipetting using an injection pump, if the distribution of multiple fluids is involved, a switching valve is generally considered. Existing switching valves include forms such as ceramic valves. A ceramic valve generally refers to a stator made by sintering a whole piece of ceramic and then performing machining, or a stator made by integrally processing materials such as engineering plastics, PTFE, PEEK, and stainless steel, which is matched with a rotor made by processing materials such as ceramic, engineering plastics, PTFE, PEEK, and stainless steel. The stator and the rotor are sealed by fitting two surfaces. The rotor is connected to the motor shaft, and the motor drives the rotor to rotate, connecting the holes on the stator with the grooves on the rotor, thereby realizing the inflow and outflow of fluid (such as liquid), and further realizing the distribution of the fluid.

[0003] Under normal operating conditions, the stator and the rotor are mutually fitted, and the two surfaces are sealed by machining accuracy. The holes on the stator are connected through the grooves on the rotor to complete the distribution of the fluid (such as the liquid path of the liquid) by the rotary valve. After being used or operated for a period of time, crystallization, blockage, or wear will occur at the fitting surface, which cannot be observed from the outside at this time. If the crystallization or particles are not processed in time, the fitting and sealing surfaces will be worn, resulting in liquid leakage, which will further affect the normal fluid distribution and the service life of the equipment. Moreover, generally, the materials of the stator and the rotor will be hard on one side and soft on the other side. Due to the different hardnesses, after long-term use, the soft side will be worn, resulting in liquid leakage. Moreover, the existing switching valve cannot effectively relieve pressure when the pressure is too high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a switching valve for multi-channel switching and an injection pump, which solve the problems such as crystallization or wear affecting the service life.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0006] The present invention provides a switching valve for multi-channel switching and an injection pump, including a stator housing part, a first gasket, a second gasket, and a rotor part. Among them,

[0007] The stator housing part has a first recess, and a second recess located within the first recess;

[0008] At least one first gasket is installed within the second recess, and at least one second gasket is installed on the first gasket;

[0009] A plurality of sub-ports are provided on the stator housing portion, where

[0010] Each of the sub-ports is connected to its respective second flow channel through its respective first flow channel;

[0011] An opening is formed on the second recess portion for each of the second flow channels.

[0012] As a preferred technical solution of the present invention, a central flow channel is further provided on the second recess portion, and an opening is also formed on the second recess portion for the central flow channel, where

[0013] The central flow channel is connected to the discharge port through a discharge flow channel communicating therewith.

[0014] As a preferred technical solution of the present invention, the cross-section of the second recess portion includes a polygon or an ellipse, where

[0015] The cross-sections of the first gasket and the second gasket are adapted to the cross-section of the second recess portion.

[0016] As a preferred technical solution of the present invention, openings corresponding to each second flow channel and openings adapted to the central flow channel are provided on both the first gasket and the second gasket.

[0017] As a preferred technical solution of the present invention, at least one through hole and at least one notch are further provided on the first recess portion, where

[0018] The notch communicates with the outside.

[0019] As a preferred technical solution of the present invention, the rotor portion is attached to the second gasket, where

[0020] The rotor portion further has a buffer mechanism;

[0021] A flow transfer cavity is provided on the contact surface between the rotor portion and the second gasket for communicating one second flow channel with the central flow channel.

[0022] As a preferred technical solution of the present invention, the stator housing portion is made of a polymer material.

[0023] As a preferred technical solution of the present invention, the first gasket is made of rubber; the second gasket is made of ceramic.

[0024] As a preferred technical solution of the present invention, the stator housing portion and the rotor portion are connected by a mounting member;

[0025] A rotor housing portion is further mounted on the rotor portion.

[0026] The present invention also provides an injection pump, which has a switching valve for multi-channel switching as described above.

[0027] The beneficial effects of the present invention are as follows: Through the design of the special-shaped first gasket and second gasket, the present invention realizes a closer combination of the stator and the rotor, and the sandwich structure improves the sealing and wear-resistant characteristics of the entire stator; at least one through hole is provided in the first recess, which can introduce warm injection water to wash the crystal, reducing the risk of wear or adhesion and avoiding reducing the service life; when the pressure inside the valve head flow path is too high, or when the pressure of the flow path hole is too high due to blockage, the rear end of the rotor part is supported by a corrugated spring with a specific elasticity (i.e., a buffer mechanism). The excessive pressure will lift the place where the rotor and the stator are in contact and discharge and relieve the pressure through this through hole and notch. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is one of the structural schematic diagrams of the present invention;

[0029] Figure 2 is one of the structural schematic diagrams of the present invention;

[0030] Figure 3 is one of the structural schematic diagrams of the present invention;

[0031] Figure 4 is one of the structural schematic diagrams of the present invention;

[0032] Figure 5 is one of the structural schematic diagrams of the present invention;

[0033] Figure 6 is one of the structural schematic diagrams of the present invention;

[0034] Figure 7 is one of the structural schematic diagrams of the present invention;

[0035] Figure 8 is one of the structural schematic diagrams of the present invention;

[0036] Figure 9 is one of the structural schematic diagrams of the present invention; Figure 10 is one of the structural schematic diagrams of the present invention;

[0037] In the figure: 1. Stator housing part; 11. First recess; 111. Second recess; 12. Sub-interface; 121. First flow channel; 122. Second flow channel; 13. Central flow channel; 14. Discharge flow channel; 15. Discharge interface; 16. Through hole; 17. Notch; 2. First gasket; 3. Second gasket; 4. Rotor part; 41. Buffer mechanism; 42. Flow conversion cavity; 5. Rotor housing part; 6. Mounting part. DETAILED DESCRIPTION OF THE INVENTION

[0038] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] Embodiment 1

[0040] As Figures 1-9 shown, this embodiment provides a switching valve for multi-channel switching, including a stator housing portion 1, a first gasket 2, a second gasket 3, and a rotor portion 4. Among them,

[0041] The stator housing portion 1 has a first recess 11 and a second recess 111 located within the first recess 11; at least one first gasket 2 is installed within the second recess 111, and at least one second gasket 3 is installed on the first gasket 2; in this embodiment, the cross-section of the second recess 111 includes a polygon or an ellipse. Among them, the cross-sections of the first gasket 2 and the second gasket 3 are adapted to the cross-section of the second recess 111. The structural design of the stator polygon (irregular shape, ellipse, etc.) does not require additional positioning design compared with the traditional circular structure design.

[0042] Regarding how to achieve the distribution of fluids, a plurality of branch interfaces 12 are provided on the stator housing portion 1. Among them, each branch interface 12 is connected to its respective second flow channel 122 through its respective first flow channel 121; each second flow channel 122 has an opening formed on the second recess 111. The second recess 111 also has a central flow channel 13, and the central flow channel 13 also has an opening formed on the second recess 111. Among them, the central flow channel 13 is connected to the discharge interface 15 through the discharge flow channel 14 connected thereto. Openings corresponding to each second flow channel 122 and openings adapted to the central flow channel 13 are provided on both the first gasket 2 and the second gasket 3.

[0043] The rotor portion 4 is attached to the second gasket 3. Among them, the rotor portion 4 also has a buffer mechanism 41;

[0044] At least one through hole 16 and at least one notch 17 are further provided on the first recess 11, and the notch 17 communicates with the outside. When the pressure inside the valve head flow path is too high, or when the pressure of the flow path hole is too high due to blockage, the rear end of the rotor portion is supported by a corrugated spring with a specific elastic force (i.e., the buffer mechanism 41). The excessive pressure will lift the place where the rotor and the stator are in contact and discharge and relieve the pressure through the through hole 16 and the notch 17; in this embodiment, the corrugated spring (i.e., the buffer mechanism 41) is preferably a spring with a force of 0.7 - 0.9 N.

[0045] On the contact surface between the rotor part 4 and the second gasket 3, there is a flow transfer cavity 42 for connecting a second flow channel 122 and the central flow channel 13. When the rotor part 4 rotates, the flow transfer cavity 42 can conduct different branch interfaces 12 and the central flow channel 13, thereby realizing the distribution function of the fluid.

[0046] The stator housing part 1 is made of polymer materials, including one of opaque materials, translucent materials, and transparent materials. Among them, the opaque ones include engineering plastics such as PEEK and PPS, the translucent ones include PTFE, PCTFE, etc., and the transparent materials include materials such as PEI, PSU, PMMA, and PC. The first gasket 2 is made of rubber, including soft rubber materials such as fluororubber, EPDM, PTFE, and PCTFE, or corrosion-resistant adhesives such as UV glue, epoxy resin glue, and alumina ceramic glue. In this embodiment, EPDM is preferably selected, and the thickness is preferably less than 0.5 mm, which plays a role in stabilizing the second gasket 3; the second gasket 3 is made of ceramic and forms the stator part. Preferably, the rotor part 4 is also made of ceramic, preferably modified ceramic. The second gasket 3 and the rotor part 4 can be selected from one of alumina and zirconia; preferably, the performance is better when the RA value is lower than 0.03; preferably, the sealing diameter surface is greater than 2 mm;

[0047] In this embodiment, in the sealing pressure of the switching valve, the positive pressure is not less than 60 psi, and the negative pressure is not greater than -45 psi.

[0048] The stator housing part 1 and the rotor part 4 are connected by a mounting part 6; a rotor housing part 5 is also installed on the rotor part 4.

[0049] Table 1

[0050]

[0051] As can be seen from Table 1, the solution in this embodiment is superior to the traditional switching valve in terms of various performances.

[0052] Specifically, it effectively solves the risk of valve body leakage caused by crystallization problems. The visual design can timely detect leakage or crystallization problems for treatment to reduce the risk of valve body damage. At the same time, injecting liquid regularly through the pressure relief hole to dissolve internal impurities and crystallization can also improve its service life, and the full ceramic surface fitting can ensure the service life of the valve body.

[0053] Through the design of the irregular first gasket 2 and second gasket 3, the present invention achieves a closer combination of the stator and the rotor, and the sandwich structure improves the sealing and wear-resistant characteristics of the entire stator; at least one through hole 16 is provided on the first recess 111, which can introduce warm water injection to wash the crystal, reduce the risk of wear or adhesion, and avoid reducing the service life; when the pressure inside the valve head flow path is too high, or when the pressure of the flow path hole is too high due to blockage, the rear end of the rotor part is supported by a corrugated spring with a specific elastic force (i.e., the buffer mechanism 41), and the excessive pressure will lift the place where the rotor and the stator are in contact and discharge and relieve the pressure through the through hole 16 and the notch 17; due to the all-ceramic fitting seal, under the same material, the valve group in long-term use will not have the risk of leakage due to wear caused by inconsistent materials of the rotor or the stator.

[0054] Embodiment 2

[0055] This embodiment provides an injection pump with a multi-channel switching valve as in Embodiment 1.

[0056] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A switching valve with multi-channel switching, characterized in that It includes a stator housing (1), a first gasket (2), a second gasket (3) and a rotor part (4), wherein, The stator housing (1) has a first recess (11) and a second recess (111) located within the first recess (11); At least one first gasket (2) is installed within the second recess (111), and at least one second gasket (3) is installed on the first gasket (2); A plurality of branch interfaces (12) are provided on the stator housing (1), wherein, Each of the branch interfaces (12) is connected to its respective second flow channel (122) through its respective first flow channel (121); Each of the second flow channels (122) has an opening formed in the second recess (111).

2. The switching valve with multi-channel switching according to claim 1, characterized in that, The second recess (111) also has a central flow channel (13), and the central flow channel (13) also has an opening formed in the second recess (111), wherein, The central flow channel (13) is connected to the discharge interface (15) through a discharge flow channel (14) communicating therewith.

3. The switching valve with multi-channel switching according to claim 1 or 2, characterized in that, The cross-section of the second recess (111) includes a polygon or an ellipse, wherein, The cross-sections of the first gasket (2) and the second gasket (3) are adapted to the cross-section of the second recess (111).

4. The switching valve with multi-channel switching according to claim 3, characterized in that, Both the first gasket (2) and the second gasket (3) are provided with openings corresponding to each of the second flow channels (122) and openings adapted to the central flow channel (13).

5. The switching valve with multi-channel switching according to claim 3, characterized in that, At least one through hole (16) and at least one notch (17) are further provided on the first recess (11), wherein, The notch (17) communicates with the outside.

6. A switching valve with multi-channel switching according to claim 4 or 5, characterized in that, The rotor part (4) is attached to the second gasket (3), wherein, The rotor part (4) further has a buffer mechanism (41); A flow transfer cavity (42) is provided on the contact surface between the rotor part (4) and the second gasket (3) for communicating one of the second flow channels (122) with the central flow channel (13).

7. The switching valve with multi-channel switching according to claim 6, characterized in that, The stator housing (1) is made of a polymer material.

8. The switching valve with multi-channel switching according to claim 6, characterized in that, The first gasket (2) is made of rubber; the second gasket (3) is made of ceramic.

9. A switching valve with multi-channel switching according to claim 7 or 8, characterized in that, The stator housing (1) and the rotor part (4) are connected through a mounting member (6); A rotor housing part (5) is further installed on the rotor part (4).

10. An injection pump having a multi-channel switching valve as described in any one of claims 1 to 9.

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